org.grouplens.lenskit.transform.normalize

Class AbstractUserVectorNormalizer

java.lang.Object

org.grouplens.lenskit.transform.normalize.AbstractUserVectorNormalizer

All Implemented Interfaces:

UserVectorNormalizer

Direct Known Subclasses:

BaselineSubtractingUserVectorNormalizer

public abstract class AbstractUserVectorNormalizer
extends Object
implements UserVectorNormalizer

Abstract user vector normalizer implementation.

Since:

0.11

Constructor Summary

Constructors

Constructor and Description
AbstractUserVectorNormalizer()

Method Summary

Modifier and Type	Method and Description
MutableSparseVector	normalize(long user, SparseVector vector, MutableSparseVector target) Normalize a vector with respect to a user vector.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.grouplens.lenskit.transform.normalize.UserVectorNormalizer

makeTransformation

Constructor Detail

AbstractUserVectorNormalizer

public AbstractUserVectorNormalizer()

Method Detail

normalize

public MutableSparseVector normalize(long user,
                                     @Nonnull
                                     SparseVector vector,
                                     @Nullable
                                     MutableSparseVector target)

Normalize a vector with respect to a user vector.

Delegates to UserVectorNormalizer.makeTransformation(long, SparseVector) and the resulting VectorTransformation.

Specified by:

normalize in interface UserVectorNormalizer

Parameters:

user - The user to normalize a vector for.

vector - The user's vector for reference.

target - The vector to normalize. If null, the user vector is normalized.

Returns:

The target vector, if specified. Otherwise, a fresh mutable vector containing a normalized copy of the user vector is returned.